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Segment Information - Income From Operations Attributable To Operating Segments (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 01, 2017
Feb. 15, 2017
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting Information [Line Items]        
Revenues     $ 16,288 $ 12,755
Income from operations     292 75
Income from equity method investments     57 22
Depreciation and amortization     536 490
Capital expenditures and investments [1]     1,325 684
MarEn Bakken        
Segment Reporting Information [Line Items]        
Cash paid to acquire equity method investments   $ 500    
Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Revenues [2]     2,935 2,398
Operating Segments        
Segment Reporting Information [Line Items]        
Revenues     19,223 15,153
Income from operations     374 270
Income from equity method investments     57 22
Depreciation and amortization [3]     522 476
Capital expenditures and investments [4]     1,297 643
Cash paid to acquire equity method investments [5]     566 209
Refining & Marketing        
Segment Reporting Information [Line Items]        
Revenues     11,373 8,406
Refining & Marketing | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Revenues     2,590 2,165
Refining & Marketing | Operating Segments        
Segment Reporting Information [Line Items]        
Revenues     13,963 10,571
Income from operations [6]     (70) (86)
Income from equity method investments     2 (1)
Depreciation and amortization     267 273
Capital expenditures and investments     192 243
Speedway        
Segment Reporting Information [Line Items]        
Revenues     4,383 3,950
Speedway | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Revenues     1 1
Speedway | Operating Segments        
Segment Reporting Information [Line Items]        
Revenues     4,384 3,951
Income from operations     135 167
Income from equity method investments     13 0
Depreciation and amortization     64 63
Capital expenditures and investments     35 50
Midstream        
Segment Reporting Information [Line Items]        
Revenues     532 399
Midstream | Ozark Pipeline        
Segment Reporting Information [Line Items]        
Capital expenditures and investments $ 220      
Midstream | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Revenues     344 232
Midstream | Operating Segments        
Segment Reporting Information [Line Items]        
Revenues     876 631
Income from operations [7],[8]     309 189
Income from equity method investments     42 23
Depreciation and amortization     191 140
Capital expenditures and investments     1,070 [9] 350
Reportable Segment        
Segment Reporting Information [Line Items]        
Revenues     $ 16,288 $ 12,755
[1] Capital expenditures include changes in capital accruals, acquisitions and investments in affiliates.
[2] Management believes intersegment transactions were conducted under terms comparable to those with unaffiliated parties
[3] Differences between segment totals and MPC totals represent amounts related to unallocated items and are included in “Items not allocated to segments” in the reconciliation below.
[4] Capital expenditures include changes in capital accruals, acquisitions (including any goodwill) and investments in affiliates.
[5] The three months ended March 31, 2017 includes an investment of $500 million in MarEn Bakken related to the Bakken Pipeline system. The three months ended March 31, 2016 includes an adjustment of $143 million to the fair value of equity method investments acquired in connection with the MarkWest Merger
[6] We revised our operating segment presentation in the first quarter of 2017 in connection with the contribution of certain terminal, pipeline and storage assets to MPLX. The operating results for these assets, which were previously included in the Refining & Marketing segment, are now included in the Midstream segment. Comparable prior period information has been recast to reflect our revised presentation. The results for the pipeline and storage assets were recast effective January 1, 2015 and the results for the terminal assets were recast effective April 1, 2016. Prior to these dates these assets were not considered businesses and therefore there are no financial results from which to recast segment results.
[7] Corporate overhead expenses attributable to MPLX are included in the Midstream segment. Corporate overhead expenses are not allocated to the Refining & Marketing and Speedway segments.
[8] Corporate overhead expenses attributable to MPLX are included in the Midstream segment. Corporate overhead expenses are not allocated to the Refining & Marketing and Speedway segments.
[9] The three months ended March 31, 2017 includes $220 million for the acquisition of the Ozark pipeline and an investment of $500 million in MarEn Bakken related to the Bakken Pipeline system.